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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26576a24d0f67ed6318f3c77a03229899a560d7d48d28be166e3332e9b2847dc' 
  AND token = 'bmhq03mu9rZj2+TmaDybSkyGc/bUd381ujM2He4poTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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