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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f7cfd1a40af8e527abdae1e1a89a01e9deaa5969a62f2d5ac422c3279ec651' 
  AND token = 'ogzGE6zcuUM6e8gtJymo2BCRRxPxsw81JgnN5h3UNlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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