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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267325a9b608379c6e10e50c0f9078b9cd99306576b492c568b59d5ee6f74071' 
  AND token = 'WueBjilLGdg1V+4ruOBqy9d+IER1lhf0ZPcRrti9WIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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