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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea20bf3806df858ede663c076f2c1243f9b208ce2d617037e4601e893adf1e7' 
  AND token = '6Pf4zkAJ6ISs3D+h9Dj7z5IlzOi+ctk1X/BquDbr8B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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