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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e7fd36e93ba93f9346d6ba80a6bcc2eaaa4d1c6760dfc6db1ba7e38ed45fc10' 
  AND token = 'EeWXFy8jup/4E6MVbe7lN6XIRo4uInw+8cRwPfvCdS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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