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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c86d35c77ff29c1ca16fe72a98ce5cd90404334bff3a121a330a00bebed0b90' 
  AND token = 'I/uThjLO8mTuHnJaGWJmPLFNZri4C+9/TVrxeutiSTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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