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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2694cf71f6fd9a93dd5c51b730c1fbfb9fdac282d6487619e6e6b3d255c64ee' 
  AND token = 'OUjZQVqkSMZYBDWn9EM/lz9q7KRK39KeoYj7kYfm300=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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