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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1a7128cf3efbfc1fc6c67b1b0178e6f67b8b470d1c67b78aa168263d6c6d4ab' 
  AND token = 'Ga9I5RamVTbfNBmFw+U5WIBi9uMYTSHd1p+Zj75htdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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