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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00dbaf4f201a1f3f77d15864bdf6201e9eddb5a73c0f51de94a6398f0540c9e5' 
  AND token = 'vyGHOnaIYvJ3SyDHFET7Qb1lpbQs3Bt0PuWrfXe0Ej4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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