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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ccdf34bb6ca85e681c13ec95833cae8609ba69d540951b3826851e7cc82198' 
  AND token = 'uMm35BIgsNZ5F9kUFwE1yxGBuEOD4ipITh8THfXID+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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