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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee65293c643868cedd9a167df848a2e8eee21fc650679b09df02c939621d67d' 
  AND token = '10d6KJoA3up6yGwibb/qW6DyhKHJ9iH0JUwx396oEWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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