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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d93482d80dc167c8b4496aae786ff4df33caed0eefcddc1e1ff6dcfa38018bd' 
  AND token = 'dsMdCSkHj4N0l6lLRXq7F68N9rkMTRaxfBGclsa2UUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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