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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db1c6f3fe6df3cebca7da18ccbfc49751aa0cea87c9e2c790cf82bd1ea0e6683' 
  AND token = 'AGpk6/DaWnmwWVJEM96IG75QmMIH14EhQs7VVYxEty0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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