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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62efd7052289efbea22537993964e871177954c5fadbb1ca1b5152b16a7b8c8c' 
  AND token = 'DYvHT7OE+ziLUY7Cd7KL10OZ5tCE7PwOgbnGliA54Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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