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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ca09b3cc6939e2eb3e07cfc9a2a4df7b6488c3d6ceff10f9887e91c508825e' 
  AND token = 'pzJRqDOlf1B35ePRvvU5kPxOxnsQawIvsuxipOrmvIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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