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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7642135b22c558fc87f4e2c83562dfdcf252bde97ea65cc800a2aeea8ead403a' 
  AND token = 'Qrf2KYtOiyI5dj4dZDCim5Jfjen6BcVzZrd06rPglUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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