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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f514f04bcac312a4abbddf6f1ecf4dbc30043dabcb8fe59f73a2ede74ea14780' 
  AND token = '+TfCu9GIvIWez/fqSj9kSSQT16QxFacUW1+uY5DyDKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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