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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50e73ec76d22e95a78f8cfe53ab29fb0ef0d10d2292e0b9a23f512caabd403b8' 
  AND token = 'g8iGJtyfM5ZngA239MIUvL3qqC3O07SBKsk6O08PU68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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