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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0fac65ac48b020610c60e39288925250ca2801fb0fbc4d6df3a6c21e3b5faee' 
  AND token = 'Xn32dHiC0brC1czqZWMdhNwIOIgeJJmMmRqMZI3Gat4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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