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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513f11f2deeb2bfb7923b092c67842ec937f135a7b8007f4036d4d4e59d6e2d4' 
  AND token = '8VyZnLIAACEraiG2F3u80oLO+IX3oLUSapGlM2VJ6o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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