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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7dc647eb3a73c88794f9b27cbd3304566bd5cc1a453001e3337434135c60c8b' 
  AND token = 's8Ak0zVv4XWFeG5PD3tpYOuJzPioCtHftQITVQa3ZP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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