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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '920475c2a9de6ab294788a49b3ed45cc95397e6506f6c5cdf586643a14266da8' 
  AND token = 'WcBb0LbRO5G9mdOtgM0wzBOwHBKoQ47b7Qe6WDyJRnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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