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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4549a8186399afc17c9dc857c07c97c5c7783c5951fc94525db4dd8f0dd150a' 
  AND token = 'kmyjO7hQWiyV6NDVUq7Y9A5XuGih1C3EmaLOAPSTmjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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