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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a42f73570803dcb24a9301b3ff3f2a62b2659a1123af6f0fc8cf1545fb1db256' 
  AND token = 'u/ltg5Mk3Ab3jUxDOOurTIp6iG6512tysenlGuwTn8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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