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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503b5759bb1b19265851f01a679bc7eda21616f8cd5d52e496defffe9cd2a48b' 
  AND token = 'j7nJ7G+WHd5NznJIyr2u2t5t+o6B+leCuEVIQVtdVHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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