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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b7ff98f098701583a2e2da486f484ae33ff86f8b774624ed6c02663c9898e3' 
  AND token = 'DjPxLyifCWaRL8/YFuN4tRf/dFIOSMSR3+xu7vOujjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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