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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cb1ac87e5f151808474bb323865328b3df499db92e04e1b24214b91ede281d5' 
  AND token = '45OIy77PQUv3fmrAvO8WV9jzRQLFKqmAZrnt9SA5xEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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