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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd228c4eb69fd1155a2d92975692e7ae920ee0c47ba36ab86686c84e7d7bfc16' 
  AND token = 'ur+6C+06IE3ZALc4ZjVEWGT438jl68qrNFThy+ytMNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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