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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd17d9a96669935b64bf53d93c4dc0bac9b3cd9138e8e79c52dce07bd293ad98b' 
  AND token = 'rsIJ8f6vJyJ77IJQGvgF34xul4Yscq+Vg0nThjzamr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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