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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4832e385e1e8d4a53b3d615e78bf1e674e34cec9528401c4dc9faa15f55e8c3e' 
  AND token = 'DaPgSzcftZlwM9ArY5XFciUL4LNF+TFQrvt2jfDItVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}