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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07eb5d4aa4752420ade228f8ac89144e683a1f0bfd831556adc18f87161e9b41' 
  AND token = 'pEofyFthKUKle0c0WuvTrqtm/ML9yk1xx/2PN5McH0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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