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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5746c8c59a2ed62f920e12e38efdd0626075725dc73ae910eab948f2cbea3199' 
  AND token = 'kfKGUWyR6qnComUGusy0sOb0ugOs3/Tbf6kqLUTVBYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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