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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb33d269b61be6e299cfd8b32b6d512bbe04e4cf5e2d464e779f09ba6f2bc4b2' 
  AND token = 'quI5v7lfIA0LvJvaznJJRUtSfjZwGd1+uIuV+Cqru10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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