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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e350260ffade3777013fcf82ecd6a0dbc4c9ff7286acac0a0620e7565490ffe1' 
  AND token = 'xJWliimpU+f2pEvG0bMZqNV6xFva06Opx2OHPQf7dzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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