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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7ed53274ccc7683ca7215ad436fb7a3408679f6aa93df3b56d7f278dfa8309' 
  AND token = 'GsnPnCfVN92uYCY2zfYFDtsc3Thqt/Rf9YiJ5rY7JMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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