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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0418f8c71d7248c3d66fa827ec357565e5e6322fa8ef84d492dc77311a69694' 
  AND token = 'MOloED3NPK4q3aBOwrdNjdkehltjS78ngZYBz3aq1VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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