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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8756d7c6f5e42ce71f936071411096116aa2e03de3df44dea65629ebeefe7d9' 
  AND token = 'YMMGaruWeOxo6Sa2J3Rs615psu4JpdOH/0elxCOzEsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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