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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89832c8ae0b5bf35e20778afd6bbe4472ea60b9e0ae07d182889ebdd5e2aa5bc' 
  AND token = 'xQ6FtrrX6lcFlfbTcAMibLf8b74xA3b+TrQjOL5UlYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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