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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93cb5a7cc81ae31e12cc5e6a18fd8f3c39a19cfff3245c58cd18ac90e57703ef' 
  AND token = '9KLUs5mu6bUwfSc5OrVcgwleC5rjUdURTghojxOpRFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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