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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0bb0e5b0f6921613a5dd8e2fc3351e46a4eaeaecbb8c6d203fcb8976f09533d' 
  AND token = 'YuccqElWX070l7kESXDDgP7xJny/bO2OwasAI7/nl88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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