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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e90af186924aa2e8c0b2294883111ca5cde953167c2f93a7a3f3169acc8072' 
  AND token = 'SzoQFfI1d6eRZ/j4yGm5w9tg4YrOj3XzzPuh/RjmriE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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