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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f690fc0f441e598d16f4c43ffc2cd9681919efa35405370e273d8d2686d305' 
  AND token = 'o/ZIth5VwtZa5klhjsdbSBEabmXoEaRZX8I8aU1NNdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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