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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8959ae58b786247c10be3a43c80f6fc3501de04e430eb32607e6a22e46c879e' 
  AND token = 'UwIVbnpLcCT15wOO8+QpFRi6PWPBApH6CUihYbFLb/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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