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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7952a36ba10430e737d1b8a1b601c1993748c0b401afb669725aaf26bb806234' 
  AND token = 'zO9jRGFjo09Kv9gPNoGR4HtXNkNFk1TqS9blPjp/OIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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