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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7b64b8f96a3a97d00279af32e6a65a6236e4bc27a09103315dfe48588502bb' 
  AND token = 's6M/Dfuhwv7WHoC8LmiU5W4ljIEENDAmY1M4DrZXhRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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