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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46eac42465fd9de08215206b3e1f50f2a4db20ca45e7bb176b4f1c47bf8a14a6' 
  AND token = 'BseDPXOOvQ4P4skf5l+781FHzxdILcAUa4EOX64kBX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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