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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8affe8dfa670d615f8c5bbc84b9121822f29385421dd76a0a8fd162aa3dcba0' 
  AND token = 'WZcS88Mb/QLscOlCjAlBNM6tzXDLszE2C2wloQcsqBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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