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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd085b2c147ad9fb489f8ba0385d59eaf43b471676dcd7787e3baba19f74ae476' 
  AND token = '2WYYbGY4lrUypclsyTDXuRDe691nn8bxtChiXUbcvoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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