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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35b258f1442e911c1fff47919a552fe943af1e68fa5ca9a8b00437be1d5cdcaf' 
  AND token = '2tzF21ax4SKWVolEurFuOX8/tVANXXFWEchoLqXfgYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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