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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ff7a4a6803730f0779ac4a434eb96711a5a6a50c3ec4b1399516b39ca2cdf80' 
  AND token = '9Juj92rv57SVuB24X5NyuEd/37KTMvH7s2s0AmbsAfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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