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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9067f7df4e71809f679ebfe47c2c05fd5369f608b48ce480f7f15c8014499ad' 
  AND token = 'b9iurNLdAq1s94/8Yf7N3Fetg0SswKd+PO3mHcTwCRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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