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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ba693058b8719f288620cd2d0297cac3ca0e6c12c613136fc0a8cc7bd1ca0a' 
  AND token = 'fACS0paXXbSOr72Zun4cjM4hIqWRcCvPq2YmfoqPxpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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