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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88418ad3fb635be075f7c4fe371b602381b37f72e97c0bb5471010c9fd47442e' 
  AND token = 'cTJVsfe9Ec3/O4xFM9Fa0mMUcFDxln3/2tIy9YwUSQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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