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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf4fa4a28bd55281ec2d3d10f29b3bc5babf3aced8e6b5772f2f150902b2e3c' 
  AND token = 'gUiLz9swRwWLEtn1r+xaYRX9YkgeqFpUl8IvF5g/R2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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