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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11e5f91d41666e7f28bcb8fe5f0f7b707f894338720cbbd8fa041ffb1dc026a2' 
  AND token = 'P/tnQ10rxphx8WqJ+D5bjvhjbz00mVoVTohh8RLvZI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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