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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de73e2962bef36352b9475bdc3a520eaf4df71d33ea29df41f9cb5e4accac30' 
  AND token = 'Pa1Iiih5msKFc7N4lm5a70Ti3847wSFFuolCmMEUhiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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