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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b31a4329b6e325249b0e53b022cbe47646e12bb1b4a6caea8de4cace73217fc' 
  AND token = 'GFAKTSV/U+NWMFfyfzN6lIZwT+sXXeeL6diey1MFiOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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